The popliteus muscle can cause and contribute to pain behind the knee. Prime indicators of popliteus dysfunction is an inability to lock the knee and/or you find your pain behind the knee worsens when walking downstairs or an incline. Pain from the popliteus muscle often mimics meniscus and other knee ligament and tendon injury pain.
The brachioradialis is located on the outside of the arm and is a contributor to tennis elbow. It can cause pain on the outside of the elbow, forearm and often descends down into the wrist and thumb. It can contribute to numbness around the thumb as well as a weakened grip.
The supinator muscle is located on the thumb side of the elbow. It can contribute to pain in the elbow, forearm, and back of the hand at the base of the thumb. It can also contribute to numbness and tingling in the thumb side of the hand.
The brachialis muscle connects the upper arm to the lower arm. It contributes to pain in the upper arm, elbow, thumb pad and thumb. It can also cause tingling and / or numbness in the back of the forearm into the thumb. Bending and straightening the elbow is painful.